This impressive model provides a certain operation array all the way down to -25°C ambient temperature, though utilising the refrigerant properties of R290 to competently reach higher h2o temperatures nearly 75°C and a low GWP (World wide Warming Opportunity). While in the unusual occasion which they do require planning authorization, https://purethermal.co.uk/media-news/q4-launch-lithium-large-capacity-r290-ashp-from-pure-thermal-and-enerblue/